Analysis and Suppression of Induced Circulating Currents in Segmented DWPT Systems With a Primary-Side LCC Compensation Network

In segmented dynamic wireless power transfer (DWPT) systems, the presence of cross-coupling mutual inductance leads to the generation of induced circulating current (ICC) in the inactive rails, resulting in power loss, magnetic field leakage, increased inverter capacity, and reduced efficiency. To address this problem, a parameter configuration method based on resonance tuning coefficient λ is proposed. This method effectively suppresses ICC, reduces inverter capacity, and improves system efficiency. In addition, it is found that the abnormal drop in inverter current during λ tuning is caused by multiple resonance points at the inverter input impedance. For scenarios involving multiple power supply rails (PSRs), it is revealed that under conventional parameter configuration method, the ICC exhibits hyperbolic-sine-type damped diffusion behavior. Building on this, a general circuit analysis model is proposed for different operating modes of PSR, with circuit parameters summarized and a design flowchart provided. Finally, a 12-meter DWPT platform is built to validate the proposed method, achieving maximum output power of 63.39 kW and system efficiency of 94.15%.